package com.itheima.filter;/*
 *      .--,       .--,
 *     ( (  \.---./  ) )
 *     '.__/o   o\__.'
 *        {=  ^  =}
 *         >  -  <
 *        /       \
 *       //       \\
 *      //|   .   |\\
 *      "'\       /'"_.-~^`'-.
 *         \  _  /--'         `
 *       ___)( )(___
 *      (((__) (__)))    高山仰止,景行行止.虽不能至,心向往之。
 *
 * @author JiaoDaoNiu
 * @create 2022-09-23-9:28
 */

import com.alibaba.fastjson.JSON;
import com.itheima.common.BaseContext;
import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    private static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
      HttpServletRequest request= (HttpServletRequest) servletRequest;
        HttpServletResponse response= (HttpServletResponse) servletResponse;

         /* //获取请求路径准备判断
        StringBuffer requestURL = request.getRequestURL();

        //定义需要过滤的路径
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**"
//                "//**",
        };

        //2、判断本次请求是否需要处理
        boolean check = check(requestURL.toString(), urls);

        //如果不需要处理，则直接放行
        if(check){
            log.info("本次不需要处理");
            filterChain.doFilter(request,response);
            return;
        }

        //判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;*/


        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();// /backend/index.html

        log.info("拦截到请求：{}",requestURI);

        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/aliapy",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/addressBook/*",
                "/addressBook"
        };

        //2、判断本次请求是否需要处理
        boolean check = check(requestURI,urls);

        //3、如果不需要处理，则直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //4、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            //写完公共字段填充后怎么把数据传递过去，session因为其父接口未实现，所以只能利用当前线程获取的携带副本传递过去
            //可是这传递的是一整个对象？只能传递一个参数（map键值对）？？？
            BaseContext.setCurrentId((Long) request.getSession().getAttribute("employee"));
            filterChain.doFilter(request,response);
            return;
        }

        if(request.getSession().getAttribute("user") !=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));
            Long userId=(Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;


    }




    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String requestURI,String[] urls){
        for(String url: urls) {
            boolean match=PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
